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Geochemical aspects of some accumulation models for primary magmas
Springer Science and Business Media LLC - Tập 93 - Trang 449-458 - 1986
The compositions of primary magmas depend to some degree on the dynamic processes occurring in the partially molten region of the mantle. The compositional dependence is estimated for three models which assume either accumulation from a migmatized source region or accumulation entirely by the interstitial flow of magma. Accumulation from a migmatised region results in magmas with higher concentrat...... hiện toàn bộ
Density changes during the fractional crystallization of basaltic magmas: fluid dynamic implications
Springer Science and Business Media LLC - Tập 85 - Trang 300-309 - 1984
The dynamical behaviour of basaltic magma chambers is fundamentally controlled by the changes that occur in the density of magma as it crystallizes. In this paper the term fractionation density is introduced and defined as the ratio of the gram formula weight to molar volume of the chemical components in the liquid phase that are being removed by fractional crystallization. Removal of olivine and ...... hiện toàn bộ
Geochronology of zircon megacrysts from nepheline-bearing gneisses as constraints on tectonic setting: implications for resetting of the U-Pb and Lu-Hf isotopic systems
Springer Science and Business Media LLC - Tập 153 - Trang 389-403 - 2006
Nepheline-bearing gneisses from the 75 km2 Tambani body in the Mozambique Belt of southern Malawi, are miaskitic biotite-nepheline monzodiorites, reflecting an absence of K-feldspar, alkali amphiboles or pyroxenes, and contain euhedral zircon megacrysts up to 5 cm across. The zircons contain U = 1–1,860 ppm, Th = 0–2,170 ppm and Y = 400–1,100 ppm, and very low concentrations of all other measured ...... hiện toàn bộ
Ti-rich komatiites from northern Norway
Springer Science and Business Media LLC - Tập 105 - Trang 42-54 - 1990
Komatiites of the Karasjok Greenstone Belt, northern Norway, show two unusual features: they have certain compositional differences compared with other komatiites, and they are largely volcaniclastic in origin. Their geological setting suggests that the komatiites were crupted into shallow water, thus permitting phreatomagmatic eruption, in a small ocean basin that opened in the Baltic Shield. The...... hiện toàn bộ
Initiation of large-volume silicic centers in the Yellowstone hotspot track: insights from H2O- and F-rich quartz-hosted rhyolitic melt inclusions in the Arbon Valley Tuff of the Snake River Plain
Springer Science and Business Media LLC - - 2016
Magnesian andesite and dacite lavas from Mt. Shasta, northern California: products of fractional crystallization of H2O-rich mantle melts
Springer Science and Business Media LLC - Tập 148 - Trang 542-565 - 2004
Mt. Shasta andesite and dacite lavas contain high MgO (3.5–5 wt.%), very low FeO*/MgO (1–1.5) and 60–66 wt.% SiO2. The range of major and trace element compositions of the Shasta lavas can be explained through fractional crystallization (~50–60 wt.%) with subsequent magma mixing of a parent magma that had the major element composition of an H2O-rich primitive magnesian andesite (PMA). Isotopic and...... hiện toàn bộ
Amphibole stability in primitive arc magmas: effects of temperature, H2O content, and oxygen fugacity
Springer Science and Business Media LLC - Tập 164 - Trang 317-339 - 2012
The water-saturated phase relations have been determined for a primitive magnesian andesite (57 wt% SiO2, 9 wt% MgO) from the Mt. Shasta, CA region over the pressure range 200–800 MPa, temperature range of 915–1,070 °C, and oxygen fugacities varying from the nickel–nickel oxide (NNO) buffer to three log units above NNO (NNO+3). The phase diagram of a primitive basaltic andesite (52 wt% SiO2, 10.5 ...... hiện toàn bộ
Nontronit und Pieotit aus dem Basalt des �lberges bei Hundsangen, Westerwald
Springer Science and Business Media LLC - - 1960
Oxygen isotope constraints on the petrogenesis of the Sybille intrusion of the Proterozoic Laramie Anorthosite Complex
Springer Science and Business Media LLC - - 1999
Geochemistry of the Adamello massif (northern Italy)
Springer Science and Business Media LLC - Tập 80 - Trang 41-48 - 1982
The Tertiary Adamello massif, outcropping over an area of more than 550 km2 in the southern Alps (northern Italy) is composed mainly of granitoid rocks (granodiorite, tonalite, quartz diorite) with minor amounts of diorite and gabbro. The major and trace element composition of these rocks is comparable to calc-alkaline volcanic rocks of continental margins. The granitoid rocks display spatial and ...... hiện toàn bộ
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